<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图 -->
    <el-card>
      <!-- 提示区域 -->
      <el-alert
        title="添加商品信息"
        type="info"
        center
        show-icon
        :closable="false"
      >
      </el-alert>
      <!-- 步骤条 -->
      <el-steps
        :space="200"
        :active="activeIndex - 0"
        finish-status="success"
        align-center
      >
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>
    <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
      <!-- tab栏区域 -->
      <el-tabs :tab-position="'left'" v-model="activeIndex" :before-leave="beforeTabLeave" @tab-click="tabClicked">
        <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
                <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
                <el-input v-model="addForm.goods_price" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
                <el-input v-model="addForm.goods_weight" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
                <el-input v-model="addForm.goods_number" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类" prop="goods_cat">
                <el-cascader
                v-model="addForm.goods_cat"
                :options="catelist"
                :props="cateProps"
                @change="handleChange"></el-cascader>
            </el-form-item>
            
        </el-tab-pane>
        <el-tab-pane label="商品参数" name="1">
            <!-- 渲染表单的Item项 -->
            <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
                <!-- 复选框组 -->
                 <el-checkbox-group v-model="item.attr_vals">
                    <el-checkbox :label="cb" v-for=" (cb,i) in item.attr_vals" :key="i" border></el-checkbox>
                </el-checkbox-group>
            </el-form-item>
        </el-tab-pane>
        <el-tab-pane label="商品属性" name="2">
            <el-form-item :label="item.attr_name" v-for=" item in onlyTableData" :key="item.attr_id">
                <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
        </el-tab-pane>
        <el-tab-pane label="商品图片" name="3">
            <!-- action 表示图片要上传到后台的api地址 -->
            <el-upload
            :on-success="handleSuccess"
            :headers="headerObj"
            :action="uploadURL"
            :on-preview="handlePreview"
            :on-remove="handleRemove"
            list-type="picture">
            <el-button size="small" type="primary">点击上传</el-button>
            </el-upload>
        </el-tab-pane>
        <el-tab-pane label="商品内容" name="4">
            <!-- 副文本编辑器组件 -->
            <quill-editor v-model="addForm.goods_introduce"></quill-editor>
            <!-- 添加商品按钮 -->
            <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
        </el-tab-pane>
      </el-tabs>
    </el-form>
    </el-card>

    <!-- 图片预览 -->
    <el-dialog
    title="图片预览"
    :visible.sync="previewVisible"
    width="50%"
    >
        <img :src="previewPath" alt="" class="previewImg">
    </el-dialog>
  </div>
</template>

<script>
import _ from 'lodash'
export default {
  data() {
    return {
      activeIndex:'0',
      //添加商品表单数据对象
      addForm:{
        goods_name:'',
        goods_price:0,
        goods_weight:0,
        goods_number:0,
        //商品分类数组
        goods_cat:[],
        //图片数组
        pics:[],
        //商品的详情描述
        goods_introduce:'',
        //动态参数和静态属性
        attrs:[],
      },
      //表单验证规则
      addFormRules:{
        goods_name:[
            {required:true,message:'请输入商品名称',trigger:'blur'},
        ],
        goods_price:[
            {required:true,message:'请输入商品价格',trigger:'blur'},
        ],
        goods_weight:[
            {required:true,message:'请输入商品重量',trigger:'blur'},
        ],
        goods_number:[
            {required:true,message:'请输入商品数量',trigger:'blur'},
        ],
        goods_cat:[
            {required:true,message:'请输入选择分类',trigger:'blur'},
        ],
      },
      //商品分类数据
      catelist:[],
      //联级选择器数据规则
      cateProps:{
          label:'cat_name',
          value:'cat_id',
          children:'children',
          expandTrigger: 'hover'
      },
      //动态参数列表数据
      manyTableData:[],
      //静态属性列表数据
      onlyTableData:[],
      //上传图片的url地址
      uploadURL:'http://127.0.0.1:8888/api/private/v1/upload',
      //图片上传组件的headers请求头对象
      headerObj:{
          Authorization:window.sessionStorage.getItem('token')
      },
      //图片预览路径
      previewPath:'',
      //图片预览对话框的显示与隐藏
      previewVisible:false,

    }
  },
  created() {
    this.getCateList();
  },
  methods: {
    //获取所有商品分类数据
    async getCateList(){
        const {data:res} =await this.$http.get('categories');
        if(res.meta.status!==200){
            return this.$message.error('获取商品分类数据失败');
        }else{
            this.catelist=res.data;
            // console.log(this.catelist);
        }
    },
    //级联选择框选择项变化触发函数
    handleChange(){
        if(this.addForm.goods_cat.length!==3){
            this.addForm.goods_cat=[];
        }
        console.log(this.addForm.goods_cat);
    },
    //阻止标签页切换
    beforeTabLeave(activeName,oldActiveName){
        if(oldActiveName === '0' && this.addForm.goods_cat.length!==3){
            this.$message.error('请先选择商品分类');
            return false;
        }
    },
    //标签页切换触发事件
    async tabClicked(){
        // console.log(this.activeIndex);
        //访问的是动态参数面板
        if(this.activeIndex === '1'){
            const { data : res}=await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:'many'}});
            if(res.meta.status!==200){
                return this.$message.error('获取动态参数列表失败');
            }else{
                res.data.forEach(item => {
                    item.attr_vals =item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
                });
                this.manyTableData=res.data;
                console.log(this.manyTableData);
            }
        }
        //访问的是商品属性列表
        else if(this.activeIndex === '2'){
            const { data : res}=await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:'only'}});
            if(res.meta.status!==200){
                return this.$message.error('获取静态属性列表失败');
            }else{
                this.onlyTableData=res.data;
                console.log(this.onlyTableData);
            }
        }
    },
    //处理图片预览效果
    handlePreview(file){
        this.previewPath=file.response.data.url;
        this.previewVisible=true;
        // console.log(file);
    },
    //处理移除图片的操作
    handleRemove(file){
        //1.获取将要删除的图片的临时路径
        const filePath = file.response.data.tmp_path;
        //2.从pics数组中，找到图片对应的索引值
        const i= this.addForm.pics.findIndex(x =>{
            x.pic ===filePath
        });
        //3.根据索引删除
        this.addForm.pics.splice(i,1);
        console.log(this.addForm);
    },
    //监听图片上传成功事件
    handleSuccess(response){
        //1.拼接得到图片信息对象
        const picInfo ={ pic : response.data.tmp_path};
        //2.将图片信息对象push到数组中
        this.addForm.pics.push(picInfo);
        console.log(this.addForm);
    },
    //添加商品
    add(){
        this.$refs.addFormRef.validate(async valid=>{
            if(!valid){
                return this.$message.error('请填写必要的表单项')
            }else{
                //添加的业务逻辑
                const form=_.cloneDeep(this.addForm)
                form.goods_cat =form.goods_cat.join(',');
                //处理动态参数和静态属性
                this.manyTableData.forEach(item =>{
                    const newInfo = {attr_id:item.attr_id,attr_value:item.attr_vals.join(' ')};
                    this.addForm.attrs.push(newInfo)
                })
                this.onlyTableData.forEach(item =>{
                    const newInfo = {attr_id:item.attr_id,attr_value:item.attr_vals};
                    this.addForm.attrs.push(newInfo)
                })

                form.attrs=this.addForm.attrs;
                //发起请求
                //商品名称唯一
                const {data:res}=await this.$http.post('goods',form);
                if(res.meta.status!==201){
                    return this.$message.error('添加商品失败');
                }else{
                    this.$message.success('添加商品成功');
                    this.$router.push('/goods');
                }
            }
        })
    }

  },
  computed:{
      //三级分类id
      cateId(){
        if(this.addForm.goods_cat.length===3){
            return this.addForm.goods_cat[2];
        }else{
            return null;
        }
      },
  },

}
</script>

<style scoped>
.el-checkbox{
    margin: 0 10px 0 0 !important;
}
.previewImg{
    width: 100%;
}
.btnAdd{
    margin-top: 15px;
}
</style>